Shop Air Filter Out Of A Box Fan

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Project by BusterB posted 04-01-2014 09:37 PM 3341 views 16 times favorited 26 comments Add to Favorites Watch

Been saying I was gonna build one of these for a while. Found a 20” box fan at the big box store for 18 dollars last week that was actually American made so I grabbed it. I really liked the design of carbides floor unit and wanted to go in that direction until reality set in and I realized I didnt have enough free floor space for one. I then considered one that flush mounted to the ceiling joists but one again it wasnt an ideal solution since I didnt have a open space close to an outlet. The pics show what I came up with. Using a two stage filter (sounds high tech eh??) which consists of a fiberglas outter 1” filter and a higher effeciency 1” filter to the inside of that. Since my basment is only 900 square feet or so, this thing should move enough cubic feet to completely turn the air over several times an hour…as long as the garage door is closed anyhow…lol We shall see how it works.

-- Buster, Ocoee TN (Critics are men who watch a battle from a high place then come down and shoot the survivors - Hemingway)

26 comments so far

View farmerdude's profile


606 posts in 1461 days

#1 posted 04-01-2014 10:29 PM

Nice filter, Buster. I’d like to try that, but like you, I lack room. Looks like a good solution there, it ought to do the trick.

-- Jeff in central Me.

View JoeinGa's profile (online now)


7383 posts in 1429 days

#2 posted 04-01-2014 10:37 PM

Neat …. but one question.

The way you have it “sorta” pointed towards the garage door, when the garage door is closed will it actually circulate the air in the whole shop? Or simply suck in what’s around it and exhaust the wind out the door?

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View Monte Pittman's profile

Monte Pittman

21568 posts in 1760 days

#3 posted 04-01-2014 11:54 PM

I should build one as well. Good job.

-- Mother Nature created it, I just assemble it.

View firefighterontheside's profile (online now)


13090 posts in 1278 days

#4 posted 04-02-2014 12:17 AM

I too need to do that. I’ve used a box fan and just put the filter on the front and the suction holds it up, but I need to do the actual build so I can have stages. Your design looks good, thanks for posting.

-- Bill M. "People change, walnut doesn't" by Gene.

View whitebeast88's profile


4086 posts in 1612 days

#5 posted 04-02-2014 12:20 AM

very nice buster,way to buy american should serve you well!!!

-- Marty.Athens,AL

View patron's profile


13524 posts in 2763 days

#6 posted 04-02-2014 12:24 AM

a great add-on buster
any dust removal is better than nada
they do circulate around
if the room is sealed

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View luv2learn's profile


2409 posts in 1725 days

#7 posted 04-02-2014 12:30 AM

A nice, cheap solution for your shop air filtration. Great job buddy.

-- Lee - Northern idaho~"If the women don't find you handsome, at least they ought to find you handy"~ Red Green

View Jim Jakosh's profile

Jim Jakosh

16809 posts in 2527 days

#8 posted 04-02-2014 12:40 AM

Nice one, Buster. That ‘ll get ‘er done!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View steve_in_ohio's profile


1195 posts in 1032 days

#9 posted 04-02-2014 01:22 AM

great idea, I have thought about doing this before, but have never gotten around to it

-- steve, simple and effective

View BusterB's profile


1910 posts in 1430 days

#10 posted 04-02-2014 02:23 AM

Jeff- Thank you sir. On really nice days, I like to work outside so it really doesnt make a difference. This winter (yes we finally had a real honest to goodness winter here) I was forced to work inside a bunch so I really have been fighting the dust issue… no colder than it gets up in your neck of the woods buddy…you probably need two of em…with a warm air attachment….lol

Joe- Thanks buddy. To get the full effect, the filter probably would work best mounted in the middle of the space. Really wasnt a good option for me. I did put the intake side of the filter away from the opening so am hoping it wont be much of an issue when the door is closed. You did get me to wondering if it will create a venturi effect when the door is open…may be pulling trash in from the outside…lol

Monte- thank you sir…wasnt a bad build at all. It was just an issue of finding the time to throw it together.

Bill- Thank you sir. I thought about building one along those lines as well but saw a forum where the guy was using the two stage filter and thought it was worth a try. One of those big posi-vent fans down at the firehouse would make a great one…lol

Marty- Thank you my friend. Hope all is going well for you down yonder in bear bryant land

David- Thank you sir. It may be my imagination but I let it run for a couple of hours after I finished up today and it seemed like I could tell a difference in the feel of the whole basement. Didnt seem nearly as stuffy as it usually is with the doors closed.

L2L- Thanks Lee. I saw a real system in the Rockler catalog for 370 dollars. Mine cost about 25… I can settle for a less effcient version…lol

Jim- Thank you sir. I sure hope so.

Steve- thank you sir. Getting started on it was the worst part…lol

-- Buster, Ocoee TN (Critics are men who watch a battle from a high place then come down and shoot the survivors - Hemingway)

View doubleDD's profile (online now)


5067 posts in 1465 days

#11 posted 04-02-2014 02:57 AM

These are a quick simple idea for air filtration in the shop. Cheap too. Except for your high tech 2 stage system. ha ha
Nice work Buster.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View BTKS's profile


1984 posts in 2886 days

#12 posted 04-02-2014 03:06 AM

Good work. I have to get something to catch the fine particles before I suffer any real dust effects. Thanks for posting.

-- "Man's ingenuity has outrun his intelligence" (Joseph Wood Krutch)

View firefighterontheside's profile (online now)


13090 posts in 1278 days

#13 posted 04-02-2014 03:19 AM

Yeah, I’ve got a fan that moves 15000 cfm, but it’s a little loud and runs on gasoline.

-- Bill M. "People change, walnut doesn't" by Gene.

View MT_Stringer's profile


2820 posts in 2653 days

#14 posted 04-02-2014 03:22 AM

Way nicer than mine which is literally fan, filter and duct tape!

-- Handcrafted by Mike Henderson - Channelview, Texas

View CFrye's profile


8581 posts in 1262 days

#15 posted 04-02-2014 08:17 AM

You seem to be on a dust eradication mission! Good job! Hey, is that your shop made mallet in the 3rd pic? Looks like it has held up well. Has your apprentice woodworker card arrived yet? Thanks for sharing.

-- God bless, Candy

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